Moving files and folders, renaming a folder, deleting a folder, restoring a folder... Any action including a folder. Of course every file of any folder is closed, and nothing is opened in another program... I restart the computer, make ONLY ONE action (e.g. renaming the folder) and then I can't move it in another location. I have to restart again. It's probably an old problem (I remember it somewhere in April, perhaps in March), but then I didn't pay attention. Now I have many important files and folders that need tiding and I can't do what I want.